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[POWERPC] Cell iommu support

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This patch adds full cell iommu support (and iommu disabled mode).

It implements mapping/unmapping of iommu pages on demand using the
standard powerpc iommu framework.  It also supports running with
iommu disabled for machines with less than 2GB of memory.  (The
default is off in that case, though it can be forced on with the
kernel command line option iommu=force).

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Jeremy Kerr
2006-11-11 17:25:18 +11:00
committed by Paul Mackerras
parent acfd946a1a
commit 165785e5c0
6 changed files with 676 additions and 488 deletions
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43
arch/powerpc/platforms/cell/setup.c
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@ -30,7 +30,6 @@
#include <linux/console.h>
#include <linux/mutex.h>
#include <linux/memory_hotplug.h>
#include <linux/notifier.h>
#include <asm/mmu.h>
#include <asm/processor.h>
@ -55,7 +54,6 @@
#include <asm/of_platform.h>
#include "interrupt.h"
#include "iommu.h"
#include "cbe_regs.h"
#include "pervasive.h"
#include "ras.h"
@ -83,38 +81,11 @@ static void cell_progress(char *s, unsigned short hex)
printk("*** %04x : %s\n", hex, s ? s : "");
}
static int cell_of_bus_notify(struct notifier_block *nb, unsigned long action,
void *data)
{
struct device *dev = data;
if (action != BUS_NOTIFY_ADD_DEVICE)
return 0;
/* For now, we just use the PCI DMA ops for everything, though
* we'll need something better when we have a real iommu
* implementation.
*/
dev->archdata.dma_ops = pci_dma_ops;
return 0;
}
static struct notifier_block cell_of_bus_notifier = {
.notifier_call = cell_of_bus_notify
};
static int __init cell_publish_devices(void)
{
if (!machine_is(cell))
return 0;
/* Register callbacks on OF platform device addition/removal
* to handle linking them to the right DMA operations
*/
bus_register_notifier(&of_platform_bus_type, &cell_of_bus_notifier);
/* Publish OF platform devices for southbridge IOs */
of_platform_bus_probe(NULL, NULL, NULL);
@ -205,19 +176,6 @@ static void __init cell_setup_arch(void)
mmio_nvram_init();
}
/*
* Early initialization. Relocation is on but do not reference unbolted pages
*/
static void __init cell_init_early(void)
{
DBG(" -> cell_init_early()\n");
cell_init_iommu();
DBG(" <- cell_init_early()\n");
}
static int __init cell_probe(void)
{
unsigned long root = of_get_flat_dt_root();
@ -244,7 +202,6 @@ define_machine(cell) {
.name = "Cell",
.probe = cell_probe,
.setup_arch = cell_setup_arch,
.init_early = cell_init_early,
.show_cpuinfo = cell_show_cpuinfo,
.restart = rtas_restart,
.power_off = rtas_power_off,